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# Status: ported.
# Base revision: 64488.
# Copyright 2003 Dave Abrahams
# Copyright 2002, 2003 Rene Rivera
# Copyright 2002, 2003, 2004, 2005 Vladimir Prus
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
# Defines the "symlink" special target. 'symlink' targets make symbolic links
# to the sources.
import b2.build.feature as feature
import b2.build.targets as targets
import b2.build.property_set as property_set
import b2.build.virtual_target as virtual_target
import b2.build.targets
from b2.manager import get_manager
import bjam
import os
feature.feature("symlink-location", ["project-relative", "build-relative"], ["incidental"])
class SymlinkTarget(targets.BasicTarget):
_count = 0
def __init__(self, project, targets, sources):
# Generate a fake name for now. Need unnamed targets eventually.
fake_name = "symlink#%s" % SymlinkTarget._count
SymlinkTarget._count = SymlinkTarget._count + 1
b2.build.targets.BasicTarget.__init__(self, fake_name, project, sources)
# Remember the targets to map the sources onto. Pad or truncate
# to fit the sources given.
assert len(targets) <= len(sources)
self.targets = targets[:] + sources[len(targets):]
# The virtual targets corresponding to the given targets.
self.virtual_targets = []
def construct(self, name, source_targets, ps):
i = 0
for t in source_targets:
s = self.targets[i]
a = virtual_target.Action(self.manager(), [t], "symlink.ln", ps)
vt = virtual_target.FileTarget(os.path.basename(s), t.type(), self.project(), a)
# Place the symlink in the directory relative to the project
# location, instead of placing it in the build directory.
if not ps.get('symlink-location') == "project-relative":
vt.set_path(os.path.join(self.project().get('location'), os.path.dirname(s)))
vt = get_manager().virtual_targets().register(vt)
self.virtual_targets.append(vt)
i = i + 1
return (property_set.empty(), self.virtual_targets)
# Creates a symbolic link from a set of targets to a set of sources.
# The targets and sources map one to one. The symlinks generated are
# limited to be the ones given as the sources. That is, the targets
# are either padded or trimmed to equate to the sources. The padding
# is done with the name of the corresponding source. For example::
#
# symlink : one two ;
#
# Is equal to::
#
# symlink one two : one two ;
#
# Names for symlink are relative to the project location. They cannot
# include ".." path components.
def symlink(targets, sources):
from b2.manager import get_manager
t = get_manager().targets()
p = get_manager().projects().current()
return t.main_target_alternative(
SymlinkTarget(p, targets,
# Note: inline targets are not supported for symlink, intentionally,
# since it's used to linking existing non-local targets.
sources))
def setup_ln(targets, sources, ps):
source_path = bjam.call("get-target-variable", sources[0], "LOCATE")[0]
target_path = bjam.call("get-target-variable", targets[0], "LOCATE")[0]
rel = os.path.relpath(source_path, target_path)
if rel == ".":
bjam.call("set-target-variable", targets, "PATH_TO_SOURCE", "")
else:
bjam.call("set-target-variable", targets, "PATH_TO_SOURCE", rel)
if os.name == 'nt':
ln_action = """echo "NT symlinks not supported yet, making copy"
del /f /q "$(<)" 2>nul >nul
copy "$(>)" "$(<)" $(NULL_OUT)"""
else:
ln_action = "ln -f -s '$(>:D=:R=$(PATH_TO_SOURCE))' '$(<)'"
get_manager().engine().register_action("symlink.ln", ln_action, function=setup_ln)
get_manager().projects().add_rule("symlink", symlink)
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